<template>
    <u-popup v-model="showPop" mode="bottom" border-radius="14" :closeable="true" @close="onClose"
        :safe-area-inset-bottom="true">
        <view class="bg-white spec-contain">
            <view class="header flex">
                <u-image width="160rpx" height="160rpx" class="m-r-20" border-radius="10rpx"
                    @click="previewImage(checkedGoods.image)" :src="checkedGoods.image"></u-image>
                <view class="goods-info">
                    <view class="primary flex">
                        <price-format :first-size="46" :second-size="32" :subscript-size="32"
                            :price="group ? checkedGoods.team_price : checkedGoods.price" :weight="500" />
                        <view class="vip-price flex" v-if="!group && !isSeckill && checkedGoods.member_price">
                            <view class="price-name xxs">会员价</view>
                            <view style="padding: 0 11rpx">
                                <price-format :price="checkedGoods.member_price" :first-size="22" :second-size="22"
                                    :subscript-size="22" :weight="500" color="#7B3200" />
                            </view>
                        </view>
                    </view>
                    <view class="sm" v-if="showStock">
                        库存：{{checkedGoods.stock}}件
                    </view>
                    <view class="sm m-t-10">
                        <text>{{specValueText}}</text>
                    </view>
                </view>
            </view>
            <view class="spec-main" style="height: 550rpx;">
                <scroll-view style="max-height: 500rpx;" scroll-y="true">
                    <view class="spec-list">
                        <view v-for="(item, index) in specList" :key="index" class="spec">
                            <view class="name m-b-20">
                                {{ item.name }}
                                <text
                                    class="primary xs m-l-20">{{checkedGoods.spec_value_ids_arr[index] == '' ? '请选择'+item.name:''}}</text>
                            </view>
                            <view class="flex flex-wrap">
                                <view v-for="(specitem, index2) in item.spec_value" :key="index2" :class="'spec-item sm ' + 
                                    ( checkedGoods.spec_value_ids_arr[index] == specitem.id  ? 'checked' : '' ) + 
                                    ( isDisable(specitem.id) ? 'disabled':'')" @click="choseSpecItem(index, index2)">
                                    {{ specitem.value }}
                                </view>
                            </view>
                        </view>
                    </view>
                </scroll-view>
                <view class="good-num flex row-between m-l-20 m-r-20">
                    <view class="label">数量</view>
                    <u-number-box v-if="show" v-model="goodsNum" :min="1" :max="type === 2 ? 1 : checkedGoods.stock"></u-number-box>
                </view>
            </view>
            <view v-if="shop.is_pay" class="btns flex row-between bg-white" :class="specValueText.indexOf('请选择') != -1 || checkedGoods.stock == 0 ? 'disabled':''">
                <button v-if="showAdd && type==0" class="add-cart br60 white btn" size="lg"
                    @click="onClick('addcart')">{{yellowBtnText}}</button>
                <button v-if="showBuy" class="bg-primary br60 white btn" size="lg"
                    @click="onClick('buynow')">{{redBtnText}}</button>
                <button v-if="showConfirm" class="bg-primary br60 white btn" size="lg"
                    @click="onClick('confirm')">确定</button>
            </view>
        </view>
    </u-popup>
</template>

<script>
    export default {
        data() {
            return {
				shop: {},
                checkedGoods: {
                    stock: 0
                }, //选中的
                outOfStock: [], //缺货的
                specList: [], //规格
                disable: [], //不可选择的
                goodsNum: 1,
                showPop: false
            };
        },

        props: {
            show: {
                type: Boolean
            },
            goods: {
                type: Object
            },
            showAdd: {
                type: Boolean,
                default: true
            },
            showBuy: {
                type: Boolean,
                default: true
            },
            showConfirm: {
                type: Boolean,
                default: false
            },
            redBtnText: {
                type: String,
                default: "立即购买"
            },
            yellowBtnText: {
                type: String,
                default: "加入购物车"
            },
            showStock: {
                type: Boolean,
                default: true
            },
            group: {
                type: Boolean,
                default: false
            },
            isSeckill: {
                type: Boolean,
                default: false
            },
            // type 是用来判断是什么类型的商品0=实物商品，1=虚拟商品
            type: {
                type: Number,
                default: null
            }
            
        },

        computed: {
            // 选择的规格参数等
            specValueText() {
                let arr = this.checkedGoods.spec_value_ids?.split(',');
                let spec_str = ''
                if (arr)
                    arr.forEach((item, index) => {
                        if (item == '') spec_str += this.specList[index].name + ','
                    })
                if (this.checkedGoods?.stock != 0 && spec_str == '')
                    return `已选择 ${this.checkedGoods.spec_value_str} ${this.goodsNum} 件`
                else
                    return `请选择 ${spec_str.slice(0, spec_str.length - 1)}`
            }
        },

        watch: {
            goods(value) {
                this.specList = value.goods_spec || [];
                let goodsItem = value.goods_item || [];
				this.shop = value.shop || {}
                this.outOfStock = goodsItem.filter(item => item.stock == 0)
                // 找出库存不为0的
                const resultArr = goodsItem.filter(item => item.stock != 0)
                if (resultArr.length != 0) {
                    resultArr[0].spec_value_ids_arr = resultArr[0].spec_value_ids.split(',');
                    this.checkedGoods = resultArr[0]
                } else {
                    // 无法选择
                    goodsItem[0].spec_value_ids_arr = []
                    this.disable = goodsItem.map(item => item.spec_value_ids.split(','));
                    this.checkedGoods = goodsItem[0]
                }
            },

            specList(value) {
                if (this.checkedGoods?.stock == 0) return
                
                const res = this.goods.goods_item.filter(item => {
                    return this.checkedGoods.spec_value_ids === item.spec_value_ids
                })

                // 库存为0的规格
                const idsArr = this.checkedGoods.spec_value_ids_arr;
                const outOfStock = this.outOfStock;
                // 找出规格相同和规格不相同的余数
                const getArrGather = this.getArrResult(idsArr, outOfStock);
                // 计算出缺货的规格项
                this.disable = this.getOutOfStockArr(getArrGather, idsArr)

                if (res.length != 0) {
                    let result = JSON.parse(JSON.stringify(res[0]))
                    result.spec_value_ids_arr = result.spec_value_ids.split(',')
                    this.checkedGoods = result;
                    // 同步到父组件
                    this.$emit('change', {
                        detail: this.checkedGoods
                    });
                }
            },

            show(val) {
                this.showPop = val
            }

        },
        mounted() {
            console.log(this.type, 'spec')
        },
        methods: {
            isDisable(e) {
                const res = this.disable.filter(item => item == e)
                if (res.length != 0) return true
                else return false
            },

            onClose() {
                this.$emit('close')
            },

            onClick(type) {
                let {
                    checkedGoods,
                    goodsNum
                } = this;
                if(this.specValueText.indexOf('请选择') != -1) return this.$toast({
                    title: this.specValueText
                })
                if(checkedGoods.stock == 0) return this.$toast({
                    title: '当前选择库存不足'
                })
                checkedGoods.goodsNum = goodsNum;
                this.$emit(type, {
                    detail: checkedGoods
                });
            },

            // 选择规格
            choseSpecItem(index, index2) {
                const id = this.specList[index].spec_value[index2].id;

                // 无法选择
                const disable = this.disable.filter(item => item == id)
                if (disable.length != 0) return

                let idsArr = this.checkedGoods.spec_value_ids_arr;
                if (id == idsArr[index]) idsArr[index] = ''
                else idsArr[index] = id;
                //保存已选规格
                this.checkedGoods.spec_value_ids_arr = idsArr;
                this.checkedGoods.spec_value_ids = idsArr.join(',');
                // 重新渲染页面
                this.specList = [...this.specList]
            },

            // 过滤出需要进行禁用的规格
            getOutOfStockArr(arr, arr1, result = []) {
                arr.forEach(el => {
                    if (el.num >= (arr1.length - 1)) {
                        result.push(...el.different)
                    }
                })
                return result
            },

            // 匹配出缺货库存和已选中对比结果
            getArrIdentical(arr1, arr2, arr = [], num = 0) {
                arr1.forEach(el => {
                    arr2.forEach(el2 => {
                        if (el == el2) {
                            num += 1;
                            arr.push(el)
                        }
                    })
                });
                return {
                    num, //n个相同的
                    different: this.getArrDifference([...new Set(arr)].map(Number), arr2.map(Number)),
                    identical: [...new Set(arr)]
                }
            },

            // 匹配出已选择和缺库存的
            getArrResult(arr, outOfStock, result = []) {
                outOfStock.forEach(item => {
                    const res = this.getArrIdentical(arr, item.spec_value_ids.split(','))
                    if (res != undefined && res.length != 0) {
                        result.push(res)
                    }
                })
                return result
            },

            // 找出两个数组中参数不同的
            getArrDifference(arr1, arr2) {
                return arr1.concat(arr2).filter(function(v, i, arr) {
                    return arr.indexOf(v) == arr.lastIndexOf(v);
                });
            },

            // 查看商品图片
            previewImage(current) {
                uni.previewImage({
                    current,
                    urls: [current] // 需要预览的图片http链接列表

                });
            }

        }
    };
</script>
<style lang="scss" scoped>
    .spec-contain {
        border-radius: 10rpx 10rpx 0 0;
        overflow: hidden;
        position: relative;

        .close {
            position: absolute;
            right: 10rpx;
            top: 10rpx;
        }

        .header {
            padding: 30rpx;
            padding-right: 70rpx;
            align-items: flex-start;
            border: $-solid-border;
        }

        .spec-main {
            padding: 0 24rpx;

            .spec-list {
                padding: 30rpx 20rpx;

                .spec-item {
                    line-height: 54rpx;
                    padding: 0 30rpx;
                    background-color: #F4F4F4;
                    border-radius: 60rpx;
                    margin: 0 20rpx 20rpx 0;
                    border: 1px solid #F4F4F4;

                    &.checked {
                        background-color: #FFE9EB;
                        color: $-color-primary;
                        border-color: currentColor;
                    }

                    &.disabled {
                        opacity: .5;
                        text-decoration: line-through;
                    }
                }
            }

        }
        
        // 底部按钮无法选择
        .disabled {
            opacity: 0.4;
        }
        .btns {
            height: 120rpx;
            padding: 0 30rpx;
            margin-top: 80rpx;

            .add-cart {
                background-color: #FF9E1E;
            }

            .btn {
                margin: 0 10rpx;
                flex: 1;
            }
        }

        .vip-price {
            margin: 0 24rpx;
            background-color: #FFE9BA;
            line-height: 36rpx;
            border-radius: 6rpx;
            overflow: hidden;

            .price-name {
                background-color: #101010;
                padding: 3rpx 12rpx;
                color: #FFD4B7;
                position: relative;
                overflow: hidden;

                &::after {
                    content: '';
                    display: block;
                    width: 20rpx;
                    height: 20rpx;
                    position: absolute;
                    right: -15rpx;
                    background-color: #FFE9BA;
                    border-radius: 50%;
                    top: 50%;
                    transform: translateY(-50%);
                    box-sizing: border-box;
                }
            }
        }
    }
</style>
